中国科学院物理研究所
北京凝聚态物理国家研究中心
M02组供稿
第52期
2020年06月29日
Y3Fe5O12/NiO/ Y3Fe5O12/Pt磁子结中磁子非局域自旋霍尔磁电阻效应

  wulixuejiabuluohe(f. bloch, 1905-1983, nobel prize in 1952)zaozai1930niantichulezixuanbojiqiliangzihuajiyuan-cijizi(jianchengcizi)degainian: jiciyouxuxitongdejuyuraodongkezaizhenggeciyouxujinggezhongyibodexingshichuanbokailai,suihouzai1957nianbeiwulixuejiabotelun·buluokehaosi(b. brockhouse, 1918-2003, nobel prize in 1994)caiyongfeidanxingzhongzisansheshiyansuozhengshi。zheizhongcunzaiyuciyouxuxitongzhongdezixuanbo(cizi),xiangguangboyiyangyejuyoubolierxiangxing,keyiyonglaidingxiangqiezhangjulidichuanbozixuanxinxi。raner,zaiguoquzhangdajin90niandeshijianli,nenggoufahuiqigongnengtexingheyouyingyongjiazhideweinamichiducizixingqijianqueyizhiweinengkaifachulai,zhangqichengweiguojiqianyandaijiedenanti。

  中国科学院物理研究所/北京凝聚态物理国家研究中心磁学国家重点实验室的韩秀峰研究员课题组,2016年率先在Pt/Y3Fe5O12/Pt这种重金属(HM)和磁性绝缘体(FMI)构成的垂直磁子异质结HM/FMI/HM中,观察到了磁子为中介的电流拖拽(MECD)效应。即一层重金属中如有电流通过,由于自旋霍尔效应和界面处自旋极化电流与磁子流之间的转换,可以激发出磁性绝缘体中的磁子流,并在另一侧界面经由磁子流与自旋极化电流的逆转换,变成另一侧重金属中的自旋流,最后通过逆自旋霍尔效应生成相反方向的拖拽电流信号[H. Wu, X.F. Han, et al. PRB满堂彩 93 (2016) 060403(R)]。该实验充分证明了磁子作为自旋信息载体的可行性以及磁性绝缘体传导磁子流的有效性。该垂直磁子异质结HM/FMI/HM也成为全电学调控的一种磁子发生器。

  随后,韩秀峰课题组构建了由磁性绝缘体(FMI)和非磁性金属(NM)构成的FMI/NM/FMI磁子阀(如YIG/Au/YIG),利用自旋塞贝克效应,通过调控磁子阀上下两层磁性绝缘体的磁矩方向分别处于平行和反平行状态,可以对外输出大小不同的磁子流,构成一个有效调控磁子流的阀门开关。该成果作为编辑推荐和物理特色文章发表在《物理评论快讯》[H. Wu, X.F. Han, et al. PRL 120 (2018) 097205, Editors' suggestion & Featured in Physics]杂志上。为了进一步避免磁子阀内部两个界面处磁子流与自旋流之间的转换,减少磁子流的损耗,该课题组又构建了由磁性绝缘体FMI和反铁磁绝缘体(AFMI=AFI)构成的完全电绝缘的FMI/AFI/FMI磁子结(如YIG/NiO/YIG)。这种由磁子充当唯一信息输运载体的磁子结器件,不仅可以实现磁子阀对磁子流的100%开关比,还可以作为调控纯磁子流的磁子晶体管的基本单元[C. Y. Guo, C. H. Wan, X. F. Han, et al. PRB 98 (2018) 134426]。

  weileshixiandigonghaociziqijiandexinxichuanshuyuduqu,hanxiufengketizujinyibucaiyongcidianzufangfaqudairedianshuyunfangshi(zixuansaibeikexiaoying)laiduqucizijiedecijiegoubianhua,jizaicizijieyig/nio/yig/ptdingcengptcengzhongshijiayigexiaodedianliu,guancefaxianptzhongdianzubujinqujueyuyuptzhijiejiechudedingbucixingjueyuantiyigcengdecijufangxiang(zhengchangzixuanhuoercidianzuxiaoying),erqiehaiqujueyucizijielingyicedibucixingjueyuantiyigcengdecijufangxiang。zheishiyinweiliangcengyigcijupailiefangshidebutong(pingxinghuofanpingxing),huidaozhicizijiedengxiaocizidiandao(ciziliu)dechayi,congeryingxiangcongptcengzhurudaocizijiezhongdezixuanliu(ciziliu)daxiao。zheiyixinqizixuanliangzixiaoyingbeimingmingweicizifeijuyuzixuanhuoercidianzu(magnonic nonlocal spin hall magnetoresistance, mnsmr)xiaoyingyifanyingqicizishuyunbenzhi。xiangguangongzuoyijingfabiaozai《ziran dianzixue》[a nonlocal spin hall magnetoresistance in a platinum layer deposited on a magnon junction. natelectron-19082102a, doi: 10.1038/s41928-020-0425-9]zazhishang。youyucizijieneibumeiyoudianheshuyun,yinerbuchanshengjiaoerre,keyixiaochucizijiederenenghao。

满堂彩  shangshuciziyizhijie(cizifashengqi)、cizifa、cizijiejiqicizifeijuyuzixuanhuoercidianzuxiaoyingdefaxian,weijinhouxitonggoujianxiaochujiaoerredecizixingqijianhecizixingdianlutansuoleyitiaoquanxindejishutujing。

满堂彩  gaixiangxinjinzhanzhong,wulisuoboshishengguochenyangtongxuehewancaihuafuyanjiuyuanweigongtongdiyizuozhe,hanxiufengyanjiuyuanweitongxunzuozhe。yalisangneidaxuedezhangshufengjiaoshouhetongjidaxuedeliuyaowenjiaoshoucanyulegaixianghezuoyanjiu。gaixianggongzuodedaoleguojiazirankexuejijinwei、kejibuhezhongkeyuanyouguanxiangmudejingfeizhichi[nsfc 51831012; most 2017yfa0206200, 2016yfa0300802; xdb07030200, qyzdj-ssw-slh016, 112111kysb20170090]。

xiangguanlianjie: https://www.nature.com/articles/s41928-020-0425-9

满堂彩tu1. (a),(b)pingxingtaihefanpingxingtaiyig/nio/yig/ptyizhijiejifeijuyuzixuanhuoercidianzuxiaoying(mnsmr)shiyitu。cizizaizhenggequanjueyuancizijiezhongdefeijuyuchuanboyingxiangzhejiechujinshuptcengzhongdedianzichuandao。mnsmrxiaoyingzongtibiaoxianwei: pingxingtaidedianzudi,fanpingxingtaidedianzugao。tu(c-d)weizaicizijiedingcengptzhongtancedaodezixuanhuoercidianzu(d)tuzhonglanxianweijuyudezixuanhuoercidianzu,hongxianweimnsmr)。